Then make a plan for everything you're going todo
If you don't have a solid plan when you're building the bulk of anything will make it seem you're making no progress.
establish feasible goals and only make changes if it's absolute necessary
the amount of times I've abounded comics/storys because I never established the foundation or never finished or built a plan for the bulk of the project is making me sad. so don't fall into the same traps
(and taking breaks once in awhile todo something smaller for fun is also good thing todo :])
T7-101
Don't make game development a chore
Like art and any form a creativity, trying to force yourself to work on something just to get it done won't do anything but make things worse.
find what makes your game special (either through gameplay, story and the sort)